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freebsd-dev/sys/netinet6/in6_pcb.c
Hans Petter Selasky 59854ecf55 Convert all IPv4 and IPv6 multicast memberships into using a STAILQ 
instead of a linear array.

The multicast memberships for the inpcb structure are protected by a
non-sleepable lock, INP_WLOCK(), which needs to be dropped when
calling the underlying possibly sleeping if_ioctl() method. When using
a linear array to keep track of multicast memberships, the computed
memory location of the multicast filter may suddenly change, due to
concurrent insertion or removal of elements in the linear array. This
in turn leads to various invalid memory access issues and kernel
panics.

To avoid this problem, put all multicast memberships on a STAILQ based
list. Then the memory location of the IPv4 and IPv6 multicast filters
become fixed during their lifetime and use after free and memory leak
issues are easier to track, for example by: vmstat -m | grep multi

All list manipulation has been factored into inline functions
including some macros, to easily allow for a future hash-list
implementation, if needed.

This patch has been tested by pho@ .

Differential Revision: https://reviews.freebsd.org/D20080
Reviewed by:	markj @
MFC after:	1 week
Sponsored by:	Mellanox Technologies
2019-06-25 11:54:41 +00:00

1377 lines
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/*-
* SPDX-License-Identifier: BSD-3-Clause
*
* Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
* Copyright (c) 2010-2011 Juniper Networks, Inc.
* All rights reserved.
*
* Portions of this software were developed by Robert N. M. Watson under
* contract to Juniper Networks, Inc.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the project nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* $KAME: in6_pcb.c,v 1.31 2001/05/21 05:45:10 jinmei Exp $
*/
/*-
* Copyright (c) 1982, 1986, 1991, 1993
* The Regents of the University of California. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* @(#)in_pcb.c 8.2 (Berkeley) 1/4/94
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include "opt_inet.h"
#include "opt_inet6.h"
#include "opt_ipsec.h"
#include "opt_pcbgroup.h"
#include "opt_rss.h"
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/malloc.h>
#include <sys/mbuf.h>
#include <sys/domain.h>
#include <sys/protosw.h>
#include <sys/socket.h>
#include <sys/socketvar.h>
#include <sys/sockio.h>
#include <sys/errno.h>
#include <sys/time.h>
#include <sys/priv.h>
#include <sys/proc.h>
#include <sys/jail.h>
#include <vm/uma.h>
#include <net/if.h>
#include <net/if_var.h>
#include <net/if_llatbl.h>
#include <net/if_types.h>
#include <net/route.h>
#include <netinet/in.h>
#include <netinet/in_var.h>
#include <netinet/in_systm.h>
#include <netinet/tcp_var.h>
#include <netinet/ip6.h>
#include <netinet/ip_var.h>
#include <netinet6/ip6_var.h>
#include <netinet6/nd6.h>
#include <netinet/in_pcb.h>
#include <netinet6/in6_pcb.h>
#include <netinet6/scope6_var.h>
static struct inpcb *in6_pcblookup_hash_locked(struct inpcbinfo *,
struct in6_addr *, u_int, struct in6_addr *, u_int, int, struct ifnet *);
int
in6_pcbbind(struct inpcb *inp, struct sockaddr *nam,
struct ucred *cred)
{
struct socket *so = inp->inp_socket;
struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)NULL;
struct inpcbinfo *pcbinfo = inp->inp_pcbinfo;
u_short lport = 0;
int error, lookupflags = 0;
int reuseport = (so->so_options & SO_REUSEPORT);
/*
* XXX: Maybe we could let SO_REUSEPORT_LB set SO_REUSEPORT bit here
* so that we don't have to add to the (already messy) code below.
*/
int reuseport_lb = (so->so_options & SO_REUSEPORT_LB);
INP_WLOCK_ASSERT(inp);
INP_HASH_WLOCK_ASSERT(pcbinfo);
if (CK_STAILQ_EMPTY(&V_in6_ifaddrhead)) /* XXX broken! */
return (EADDRNOTAVAIL);
if (inp->inp_lport || !IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr))
return (EINVAL);
if ((so->so_options & (SO_REUSEADDR|SO_REUSEPORT|SO_REUSEPORT_LB)) == 0)
lookupflags = INPLOOKUP_WILDCARD;
if (nam == NULL) {
if ((error = prison_local_ip6(cred, &inp->in6p_laddr,
((inp->inp_flags & IN6P_IPV6_V6ONLY) != 0))) != 0)
return (error);
} else {
sin6 = (struct sockaddr_in6 *)nam;
if (nam->sa_len != sizeof(*sin6))
return (EINVAL);
/*
* family check.
*/
if (nam->sa_family != AF_INET6)
return (EAFNOSUPPORT);
if ((error = sa6_embedscope(sin6, V_ip6_use_defzone)) != 0)
return(error);
if ((error = prison_local_ip6(cred, &sin6->sin6_addr,
((inp->inp_flags & IN6P_IPV6_V6ONLY) != 0))) != 0)
return (error);
lport = sin6->sin6_port;
if (IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr)) {
/*
* Treat SO_REUSEADDR as SO_REUSEPORT for multicast;
* allow compepte duplication of binding if
* SO_REUSEPORT is set, or if SO_REUSEADDR is set
* and a multicast address is bound on both
* new and duplicated sockets.
*/
if ((so->so_options & (SO_REUSEADDR|SO_REUSEPORT)) != 0)
reuseport = SO_REUSEADDR|SO_REUSEPORT;
/*
* XXX: How to deal with SO_REUSEPORT_LB here?
* Treat same as SO_REUSEPORT for now.
*/
if ((so->so_options &
(SO_REUSEADDR|SO_REUSEPORT_LB)) != 0)
reuseport_lb = SO_REUSEADDR|SO_REUSEPORT_LB;
} else if (!IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) {
struct epoch_tracker et;
struct ifaddr *ifa;
sin6->sin6_port = 0; /* yech... */
NET_EPOCH_ENTER(et);
if ((ifa = ifa_ifwithaddr((struct sockaddr *)sin6)) ==
NULL &&
(inp->inp_flags & INP_BINDANY) == 0) {
NET_EPOCH_EXIT(et);
return (EADDRNOTAVAIL);
}
/*
* XXX: bind to an anycast address might accidentally
* cause sending a packet with anycast source address.
* We should allow to bind to a deprecated address, since
* the application dares to use it.
*/
if (ifa != NULL &&
((struct in6_ifaddr *)ifa)->ia6_flags &
(IN6_IFF_ANYCAST|IN6_IFF_NOTREADY|IN6_IFF_DETACHED)) {
NET_EPOCH_EXIT(et);
return (EADDRNOTAVAIL);
}
NET_EPOCH_EXIT(et);
}
if (lport) {
struct inpcb *t;
struct tcptw *tw;
/* GROSS */
if (ntohs(lport) <= V_ipport_reservedhigh &&
ntohs(lport) >= V_ipport_reservedlow &&
priv_check_cred(cred, PRIV_NETINET_RESERVEDPORT))
return (EACCES);
if (!IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr) &&
priv_check_cred(inp->inp_cred, PRIV_NETINET_REUSEPORT) != 0) {
t = in6_pcblookup_local(pcbinfo,
&sin6->sin6_addr, lport,
INPLOOKUP_WILDCARD, cred);
if (t &&
((inp->inp_flags2 & INP_BINDMULTI) == 0) &&
((t->inp_flags & INP_TIMEWAIT) == 0) &&
(so->so_type != SOCK_STREAM ||
IN6_IS_ADDR_UNSPECIFIED(&t->in6p_faddr)) &&
(!IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr) ||
!IN6_IS_ADDR_UNSPECIFIED(&t->in6p_laddr) ||
(t->inp_flags2 & INP_REUSEPORT) ||
(t->inp_flags2 & INP_REUSEPORT_LB) == 0) &&
(inp->inp_cred->cr_uid !=
t->inp_cred->cr_uid))
return (EADDRINUSE);
/*
* If the socket is a BINDMULTI socket, then
* the credentials need to match and the
* original socket also has to have been bound
* with BINDMULTI.
*/
if (t && (! in_pcbbind_check_bindmulti(inp, t)))
return (EADDRINUSE);
#ifdef INET
if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0 &&
IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) {
struct sockaddr_in sin;
in6_sin6_2_sin(&sin, sin6);
t = in_pcblookup_local(pcbinfo,
sin.sin_addr, lport,
INPLOOKUP_WILDCARD, cred);
if (t &&
((inp->inp_flags2 & INP_BINDMULTI) == 0) &&
((t->inp_flags &
INP_TIMEWAIT) == 0) &&
(so->so_type != SOCK_STREAM ||
ntohl(t->inp_faddr.s_addr) ==
INADDR_ANY) &&
(inp->inp_cred->cr_uid !=
t->inp_cred->cr_uid))
return (EADDRINUSE);
if (t && (! in_pcbbind_check_bindmulti(inp, t)))
return (EADDRINUSE);
}
#endif
}
t = in6_pcblookup_local(pcbinfo, &sin6->sin6_addr,
lport, lookupflags, cred);
if (t && (t->inp_flags & INP_TIMEWAIT)) {
/*
* XXXRW: If an incpb has had its timewait
* state recycled, we treat the address as
* being in use (for now). This is better
* than a panic, but not desirable.
*/
tw = intotw(t);
if (tw == NULL ||
((reuseport & tw->tw_so_options) == 0 &&
(reuseport_lb & tw->tw_so_options) == 0))
return (EADDRINUSE);
} else if (t && (reuseport & inp_so_options(t)) == 0 &&
(reuseport_lb & inp_so_options(t)) == 0) {
return (EADDRINUSE);
}
#ifdef INET
if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0 &&
IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) {
struct sockaddr_in sin;
in6_sin6_2_sin(&sin, sin6);
t = in_pcblookup_local(pcbinfo, sin.sin_addr,
lport, lookupflags, cred);
if (t && t->inp_flags & INP_TIMEWAIT) {
tw = intotw(t);
if (tw == NULL)
return (EADDRINUSE);
if ((reuseport & tw->tw_so_options) == 0
&& (reuseport_lb & tw->tw_so_options) == 0
&& (ntohl(t->inp_laddr.s_addr) !=
INADDR_ANY || ((inp->inp_vflag &
INP_IPV6PROTO) ==
(t->inp_vflag & INP_IPV6PROTO))))
return (EADDRINUSE);
} else if (t &&
(reuseport & inp_so_options(t)) == 0 &&
(reuseport_lb & inp_so_options(t)) == 0 &&
(ntohl(t->inp_laddr.s_addr) != INADDR_ANY ||
(t->inp_vflag & INP_IPV6PROTO) != 0)) {
return (EADDRINUSE);
}
}
#endif
}
inp->in6p_laddr = sin6->sin6_addr;
}
if (lport == 0) {
if ((error = in6_pcbsetport(&inp->in6p_laddr, inp, cred)) != 0) {
/* Undo an address bind that may have occurred. */
inp->in6p_laddr = in6addr_any;
return (error);
}
} else {
inp->inp_lport = lport;
if (in_pcbinshash(inp) != 0) {
inp->in6p_laddr = in6addr_any;
inp->inp_lport = 0;
return (EAGAIN);
}
}
return (0);
}
/*
* Transform old in6_pcbconnect() into an inner subroutine for new
* in6_pcbconnect(): Do some validity-checking on the remote
* address (in mbuf 'nam') and then determine local host address
* (i.e., which interface) to use to access that remote host.
*
* This preserves definition of in6_pcbconnect(), while supporting a
* slightly different version for T/TCP. (This is more than
* a bit of a kludge, but cleaning up the internal interfaces would
* have forced minor changes in every protocol).
*/
static int
in6_pcbladdr(struct inpcb *inp, struct sockaddr *nam,
struct in6_addr *plocal_addr6)
{
struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)nam;
int error = 0;
int scope_ambiguous = 0;
struct in6_addr in6a;
INP_WLOCK_ASSERT(inp);
INP_HASH_WLOCK_ASSERT(inp->inp_pcbinfo); /* XXXRW: why? */
if (nam->sa_len != sizeof (*sin6))
return (EINVAL);
if (sin6->sin6_family != AF_INET6)
return (EAFNOSUPPORT);
if (sin6->sin6_port == 0)
return (EADDRNOTAVAIL);
if (sin6->sin6_scope_id == 0 && !V_ip6_use_defzone)
scope_ambiguous = 1;
if ((error = sa6_embedscope(sin6, V_ip6_use_defzone)) != 0)
return(error);
if (!CK_STAILQ_EMPTY(&V_in6_ifaddrhead)) {
/*
* If the destination address is UNSPECIFIED addr,
* use the loopback addr, e.g ::1.
*/
if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr))
sin6->sin6_addr = in6addr_loopback;
}
if ((error = prison_remote_ip6(inp->inp_cred, &sin6->sin6_addr)) != 0)
return (error);
error = in6_selectsrc_socket(sin6, inp->in6p_outputopts,
inp, inp->inp_cred, scope_ambiguous, &in6a, NULL);
if (error)
return (error);
/*
* Do not update this earlier, in case we return with an error.
*
* XXX: this in6_selectsrc_socket result might replace the bound local
* address with the address specified by setsockopt(IPV6_PKTINFO).
* Is it the intended behavior?
*/
*plocal_addr6 = in6a;
/*
* Don't do pcblookup call here; return interface in
* plocal_addr6
* and exit to caller, that will do the lookup.
*/
return (0);
}
/*
* Outer subroutine:
* Connect from a socket to a specified address.
* Both address and port must be specified in argument sin.
* If don't have a local address for this socket yet,
* then pick one.
*/
int
in6_pcbconnect_mbuf(struct inpcb *inp, struct sockaddr *nam,
struct ucred *cred, struct mbuf *m)
{
struct inpcbinfo *pcbinfo = inp->inp_pcbinfo;
struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)nam;
struct in6_addr addr6;
int error;
INP_WLOCK_ASSERT(inp);
INP_HASH_WLOCK_ASSERT(pcbinfo);
/*
* Call inner routine, to assign local interface address.
* in6_pcbladdr() may automatically fill in sin6_scope_id.
*/
if ((error = in6_pcbladdr(inp, nam, &addr6)) != 0)
return (error);
if (in6_pcblookup_hash_locked(pcbinfo, &sin6->sin6_addr,
sin6->sin6_port,
IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr)
? &addr6 : &inp->in6p_laddr,
inp->inp_lport, 0, NULL) != NULL) {
return (EADDRINUSE);
}
if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr)) {
if (inp->inp_lport == 0) {
error = in6_pcbbind(inp, (struct sockaddr *)0, cred);
if (error)
return (error);
}
inp->in6p_laddr = addr6;
}
inp->in6p_faddr = sin6->sin6_addr;
inp->inp_fport = sin6->sin6_port;
/* update flowinfo - draft-itojun-ipv6-flowlabel-api-00 */
inp->inp_flow &= ~IPV6_FLOWLABEL_MASK;
if (inp->inp_flags & IN6P_AUTOFLOWLABEL)
inp->inp_flow |=
(htonl(ip6_randomflowlabel()) & IPV6_FLOWLABEL_MASK);
in_pcbrehash_mbuf(inp, m);
return (0);
}
int
in6_pcbconnect(struct inpcb *inp, struct sockaddr *nam, struct ucred *cred)
{
return (in6_pcbconnect_mbuf(inp, nam, cred, NULL));
}
void
in6_pcbdisconnect(struct inpcb *inp)
{
INP_WLOCK_ASSERT(inp);
INP_HASH_WLOCK_ASSERT(inp->inp_pcbinfo);
bzero((caddr_t)&inp->in6p_faddr, sizeof(inp->in6p_faddr));
inp->inp_fport = 0;
/* clear flowinfo - draft-itojun-ipv6-flowlabel-api-00 */
inp->inp_flow &= ~IPV6_FLOWLABEL_MASK;
in_pcbrehash(inp);
}
struct sockaddr *
in6_sockaddr(in_port_t port, struct in6_addr *addr_p)
{
struct sockaddr_in6 *sin6;
sin6 = malloc(sizeof *sin6, M_SONAME, M_WAITOK);
bzero(sin6, sizeof *sin6);
sin6->sin6_family = AF_INET6;
sin6->sin6_len = sizeof(*sin6);
sin6->sin6_port = port;
sin6->sin6_addr = *addr_p;
(void)sa6_recoverscope(sin6); /* XXX: should catch errors */
return (struct sockaddr *)sin6;
}
struct sockaddr *
in6_v4mapsin6_sockaddr(in_port_t port, struct in_addr *addr_p)
{
struct sockaddr_in sin;
struct sockaddr_in6 *sin6_p;
bzero(&sin, sizeof sin);
sin.sin_family = AF_INET;
sin.sin_len = sizeof(sin);
sin.sin_port = port;
sin.sin_addr = *addr_p;
sin6_p = malloc(sizeof *sin6_p, M_SONAME,
M_WAITOK);
in6_sin_2_v4mapsin6(&sin, sin6_p);
return (struct sockaddr *)sin6_p;
}
int
in6_getsockaddr(struct socket *so, struct sockaddr **nam)
{
struct inpcb *inp;
struct in6_addr addr;
in_port_t port;
inp = sotoinpcb(so);
KASSERT(inp != NULL, ("in6_getsockaddr: inp == NULL"));
INP_RLOCK(inp);
port = inp->inp_lport;
addr = inp->in6p_laddr;
INP_RUNLOCK(inp);
*nam = in6_sockaddr(port, &addr);
return 0;
}
int
in6_getpeeraddr(struct socket *so, struct sockaddr **nam)
{
struct inpcb *inp;
struct in6_addr addr;
in_port_t port;
inp = sotoinpcb(so);
KASSERT(inp != NULL, ("in6_getpeeraddr: inp == NULL"));
INP_RLOCK(inp);
port = inp->inp_fport;
addr = inp->in6p_faddr;
INP_RUNLOCK(inp);
*nam = in6_sockaddr(port, &addr);
return 0;
}
int
in6_mapped_sockaddr(struct socket *so, struct sockaddr **nam)
{
struct inpcb *inp;
int error;
inp = sotoinpcb(so);
KASSERT(inp != NULL, ("in6_mapped_sockaddr: inp == NULL"));
#ifdef INET
if ((inp->inp_vflag & (INP_IPV4 | INP_IPV6)) == INP_IPV4) {
error = in_getsockaddr(so, nam);
if (error == 0)
in6_sin_2_v4mapsin6_in_sock(nam);
} else
#endif
{
/* scope issues will be handled in in6_getsockaddr(). */
error = in6_getsockaddr(so, nam);
}
return error;
}
int
in6_mapped_peeraddr(struct socket *so, struct sockaddr **nam)
{
struct inpcb *inp;
int error;
inp = sotoinpcb(so);
KASSERT(inp != NULL, ("in6_mapped_peeraddr: inp == NULL"));
#ifdef INET
if ((inp->inp_vflag & (INP_IPV4 | INP_IPV6)) == INP_IPV4) {
error = in_getpeeraddr(so, nam);
if (error == 0)
in6_sin_2_v4mapsin6_in_sock(nam);
} else
#endif
/* scope issues will be handled in in6_getpeeraddr(). */
error = in6_getpeeraddr(so, nam);
return error;
}
/*
* Pass some notification to all connections of a protocol
* associated with address dst. The local address and/or port numbers
* may be specified to limit the search. The "usual action" will be
* taken, depending on the ctlinput cmd. The caller must filter any
* cmds that are uninteresting (e.g., no error in the map).
* Call the protocol specific routine (if any) to report
* any errors for each matching socket.
*/
void
in6_pcbnotify(struct inpcbinfo *pcbinfo, struct sockaddr *dst,
u_int fport_arg, const struct sockaddr *src, u_int lport_arg,
int cmd, void *cmdarg,
struct inpcb *(*notify)(struct inpcb *, int))
{
struct inpcb *inp, *inp_temp;
struct sockaddr_in6 sa6_src, *sa6_dst;
u_short fport = fport_arg, lport = lport_arg;
u_int32_t flowinfo;
int errno;
if ((unsigned)cmd >= PRC_NCMDS || dst->sa_family != AF_INET6)
return;
sa6_dst = (struct sockaddr_in6 *)dst;
if (IN6_IS_ADDR_UNSPECIFIED(&sa6_dst->sin6_addr))
return;
/*
* note that src can be NULL when we get notify by local fragmentation.
*/
sa6_src = (src == NULL) ? sa6_any : *(const struct sockaddr_in6 *)src;
flowinfo = sa6_src.sin6_flowinfo;
/*
* Redirects go to all references to the destination,
* and use in6_rtchange to invalidate the route cache.
* Dead host indications: also use in6_rtchange to invalidate
* the cache, and deliver the error to all the sockets.
* Otherwise, if we have knowledge of the local port and address,
* deliver only to that socket.
*/
if (PRC_IS_REDIRECT(cmd) || cmd == PRC_HOSTDEAD) {
fport = 0;
lport = 0;
bzero((caddr_t)&sa6_src.sin6_addr, sizeof(sa6_src.sin6_addr));
if (cmd != PRC_HOSTDEAD)
notify = in6_rtchange;
}
errno = inet6ctlerrmap[cmd];
INP_INFO_WLOCK(pcbinfo);
CK_LIST_FOREACH_SAFE(inp, pcbinfo->ipi_listhead, inp_list, inp_temp) {
INP_WLOCK(inp);
if ((inp->inp_vflag & INP_IPV6) == 0) {
INP_WUNLOCK(inp);
continue;
}
/*
* If the error designates a new path MTU for a destination
* and the application (associated with this socket) wanted to
* know the value, notify.
* XXX: should we avoid to notify the value to TCP sockets?
*/
if (cmd == PRC_MSGSIZE && cmdarg != NULL)
ip6_notify_pmtu(inp, (struct sockaddr_in6 *)dst,
*(u_int32_t *)cmdarg);
/*
* Detect if we should notify the error. If no source and
* destination ports are specifed, but non-zero flowinfo and
* local address match, notify the error. This is the case
* when the error is delivered with an encrypted buffer
* by ESP. Otherwise, just compare addresses and ports
* as usual.
*/
if (lport == 0 && fport == 0 && flowinfo &&
inp->inp_socket != NULL &&
flowinfo == (inp->inp_flow & IPV6_FLOWLABEL_MASK) &&
IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr, &sa6_src.sin6_addr))
goto do_notify;
else if (!IN6_ARE_ADDR_EQUAL(&inp->in6p_faddr,
&sa6_dst->sin6_addr) ||
inp->inp_socket == 0 ||
(lport && inp->inp_lport != lport) ||
(!IN6_IS_ADDR_UNSPECIFIED(&sa6_src.sin6_addr) &&
!IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr,
&sa6_src.sin6_addr)) ||
(fport && inp->inp_fport != fport)) {
INP_WUNLOCK(inp);
continue;
}
do_notify:
if (notify) {
if ((*notify)(inp, errno))
INP_WUNLOCK(inp);
} else
INP_WUNLOCK(inp);
}
INP_INFO_WUNLOCK(pcbinfo);
}
/*
* Lookup a PCB based on the local address and port. Caller must hold the
* hash lock. No inpcb locks or references are acquired.
*/
struct inpcb *
in6_pcblookup_local(struct inpcbinfo *pcbinfo, struct in6_addr *laddr,
u_short lport, int lookupflags, struct ucred *cred)
{
struct inpcb *inp;
int matchwild = 3, wildcard;
KASSERT((lookupflags & ~(INPLOOKUP_WILDCARD)) == 0,
("%s: invalid lookup flags %d", __func__, lookupflags));
INP_HASH_WLOCK_ASSERT(pcbinfo);
if ((lookupflags & INPLOOKUP_WILDCARD) == 0) {
struct inpcbhead *head;
/*
* Look for an unconnected (wildcard foreign addr) PCB that
* matches the local address and port we're looking for.
*/
head = &pcbinfo->ipi_hashbase[INP_PCBHASH(
INP6_PCBHASHKEY(&in6addr_any), lport, 0,
pcbinfo->ipi_hashmask)];
CK_LIST_FOREACH(inp, head, inp_hash) {
/* XXX inp locking */
if ((inp->inp_vflag & INP_IPV6) == 0)
continue;
if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr) &&
IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr, laddr) &&
inp->inp_lport == lport) {
/* Found. */
if (cred == NULL ||
prison_equal_ip6(cred->cr_prison,
inp->inp_cred->cr_prison))
return (inp);
}
}
/*
* Not found.
*/
return (NULL);
} else {
struct inpcbporthead *porthash;
struct inpcbport *phd;
struct inpcb *match = NULL;
/*
* Best fit PCB lookup.
*
* First see if this local port is in use by looking on the
* port hash list.
*/
porthash = &pcbinfo->ipi_porthashbase[INP_PCBPORTHASH(lport,
pcbinfo->ipi_porthashmask)];
CK_LIST_FOREACH(phd, porthash, phd_hash) {
if (phd->phd_port == lport)
break;
}
if (phd != NULL) {
/*
* Port is in use by one or more PCBs. Look for best
* fit.
*/
CK_LIST_FOREACH(inp, &phd->phd_pcblist, inp_portlist) {
wildcard = 0;
if (cred != NULL &&
!prison_equal_ip6(cred->cr_prison,
inp->inp_cred->cr_prison))
continue;
/* XXX inp locking */
if ((inp->inp_vflag & INP_IPV6) == 0)
continue;
if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr))
wildcard++;
if (!IN6_IS_ADDR_UNSPECIFIED(
&inp->in6p_laddr)) {
if (IN6_IS_ADDR_UNSPECIFIED(laddr))
wildcard++;
else if (!IN6_ARE_ADDR_EQUAL(
&inp->in6p_laddr, laddr))
continue;
} else {
if (!IN6_IS_ADDR_UNSPECIFIED(laddr))
wildcard++;
}
if (wildcard < matchwild) {
match = inp;
matchwild = wildcard;
if (matchwild == 0)
break;
}
}
}
return (match);
}
}
void
in6_pcbpurgeif0(struct inpcbinfo *pcbinfo, struct ifnet *ifp)
{
struct inpcb *in6p;
struct in6_multi *inm;
struct in6_mfilter *imf;
struct ip6_moptions *im6o;
INP_INFO_WLOCK(pcbinfo);
CK_LIST_FOREACH(in6p, pcbinfo->ipi_listhead, inp_list) {
INP_WLOCK(in6p);
if (__predict_false(in6p->inp_flags2 & INP_FREED)) {
INP_WUNLOCK(in6p);
continue;
}
im6o = in6p->in6p_moptions;
if ((in6p->inp_vflag & INP_IPV6) && im6o != NULL) {
/*
* Unselect the outgoing ifp for multicast if it
* is being detached.
*/
if (im6o->im6o_multicast_ifp == ifp)
im6o->im6o_multicast_ifp = NULL;
/*
* Drop multicast group membership if we joined
* through the interface being detached.
*/
restart:
IP6_MFILTER_FOREACH(imf, &im6o->im6o_head) {
if ((inm = imf->im6f_in6m) == NULL)
continue;
if (inm->in6m_ifp != ifp)
continue;
ip6_mfilter_remove(&im6o->im6o_head, imf);
IN6_MULTI_LOCK_ASSERT();
in6_leavegroup_locked(inm, NULL);
ip6_mfilter_free(imf);
goto restart;
}
}
INP_WUNLOCK(in6p);
}
INP_INFO_WUNLOCK(pcbinfo);
}
/*
* Check for alternatives when higher level complains
* about service problems. For now, invalidate cached
* routing information. If the route was created dynamically
* (by a redirect), time to try a default gateway again.
*/
void
in6_losing(struct inpcb *inp)
{
RO_INVALIDATE_CACHE(&inp->inp_route6);
}
/*
* After a routing change, flush old routing
* and allocate a (hopefully) better one.
*/
struct inpcb *
in6_rtchange(struct inpcb *inp, int errno __unused)
{
RO_INVALIDATE_CACHE(&inp->inp_route6);
return inp;
}
static struct inpcb *
in6_pcblookup_lbgroup(const struct inpcbinfo *pcbinfo,
const struct in6_addr *laddr, uint16_t lport, const struct in6_addr *faddr,
uint16_t fport, int lookupflags)
{
struct inpcb *local_wild;
const struct inpcblbgrouphead *hdr;
struct inpcblbgroup *grp;
uint32_t idx;
INP_HASH_LOCK_ASSERT(pcbinfo);
hdr = &pcbinfo->ipi_lbgrouphashbase[
INP_PCBPORTHASH(lport, pcbinfo->ipi_lbgrouphashmask)];
/*
* Order of socket selection:
* 1. non-wild.
* 2. wild (if lookupflags contains INPLOOKUP_WILDCARD).
*
* NOTE:
* - Load balanced group does not contain jailed sockets.
* - Load balanced does not contain IPv4 mapped INET6 wild sockets.
*/
local_wild = NULL;
CK_LIST_FOREACH(grp, hdr, il_list) {
#ifdef INET
if (!(grp->il_vflag & INP_IPV6))
continue;
#endif
if (grp->il_lport != lport)
continue;
idx = INP_PCBLBGROUP_PKTHASH(INP6_PCBHASHKEY(faddr), lport,
fport) % grp->il_inpcnt;
if (IN6_ARE_ADDR_EQUAL(&grp->il6_laddr, laddr))
return (grp->il_inp[idx]);
if (IN6_IS_ADDR_UNSPECIFIED(&grp->il6_laddr) &&
(lookupflags & INPLOOKUP_WILDCARD) != 0)
local_wild = grp->il_inp[idx];
}
return (local_wild);
}
#ifdef PCBGROUP
/*
* Lookup PCB in hash list, using pcbgroup tables.
*/
static struct inpcb *
in6_pcblookup_group(struct inpcbinfo *pcbinfo, struct inpcbgroup *pcbgroup,
struct in6_addr *faddr, u_int fport_arg, struct in6_addr *laddr,
u_int lport_arg, int lookupflags, struct ifnet *ifp)
{
struct inpcbhead *head;
struct inpcb *inp, *tmpinp;
u_short fport = fport_arg, lport = lport_arg;
bool locked;
/*
* First look for an exact match.
*/
tmpinp = NULL;
INP_GROUP_LOCK(pcbgroup);
head = &pcbgroup->ipg_hashbase[INP_PCBHASH(
INP6_PCBHASHKEY(faddr), lport, fport, pcbgroup->ipg_hashmask)];
CK_LIST_FOREACH(inp, head, inp_pcbgrouphash) {
/* XXX inp locking */
if ((inp->inp_vflag & INP_IPV6) == 0)
continue;
if (IN6_ARE_ADDR_EQUAL(&inp->in6p_faddr, faddr) &&
IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr, laddr) &&
inp->inp_fport == fport &&
inp->inp_lport == lport) {
/*
* XXX We should be able to directly return
* the inp here, without any checks.
* Well unless both bound with SO_REUSEPORT?
*/
if (prison_flag(inp->inp_cred, PR_IP6))
goto found;
if (tmpinp == NULL)
tmpinp = inp;
}
}
if (tmpinp != NULL) {
inp = tmpinp;
goto found;
}
/*
* Then look for a wildcard match in the pcbgroup.
*/
if ((lookupflags & INPLOOKUP_WILDCARD) != 0) {
struct inpcb *local_wild = NULL, *local_exact = NULL;
struct inpcb *jail_wild = NULL;
int injail;
/*
* Order of socket selection - we always prefer jails.
* 1. jailed, non-wild.
* 2. jailed, wild.
* 3. non-jailed, non-wild.
* 4. non-jailed, wild.
*/
head = &pcbgroup->ipg_hashbase[
INP_PCBHASH(INADDR_ANY, lport, 0, pcbgroup->ipg_hashmask)];
CK_LIST_FOREACH(inp, head, inp_pcbgrouphash) {
/* XXX inp locking */
if ((inp->inp_vflag & INP_IPV6) == 0)
continue;
if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr) ||
inp->inp_lport != lport) {
continue;
}
injail = prison_flag(inp->inp_cred, PR_IP6);
if (injail) {
if (prison_check_ip6(inp->inp_cred,
laddr) != 0)
continue;
} else {
if (local_exact != NULL)
continue;
}
if (IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr, laddr)) {
if (injail)
goto found;
else
local_exact = inp;
} else if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr)) {
if (injail)
jail_wild = inp;
else
local_wild = inp;
}
} /* LIST_FOREACH */
inp = jail_wild;
if (inp == NULL)
inp = jail_wild;
if (inp == NULL)
inp = local_exact;
if (inp == NULL)
inp = local_wild;
if (inp != NULL)
goto found;
}
/*
* Then look for a wildcard match, if requested.
*/
if ((lookupflags & INPLOOKUP_WILDCARD) != 0) {
struct inpcb *local_wild = NULL, *local_exact = NULL;
struct inpcb *jail_wild = NULL;
int injail;
/*
* Order of socket selection - we always prefer jails.
* 1. jailed, non-wild.
* 2. jailed, wild.
* 3. non-jailed, non-wild.
* 4. non-jailed, wild.
*/
head = &pcbinfo->ipi_wildbase[INP_PCBHASH(
INP6_PCBHASHKEY(&in6addr_any), lport, 0,
pcbinfo->ipi_wildmask)];
CK_LIST_FOREACH(inp, head, inp_pcbgroup_wild) {
/* XXX inp locking */
if ((inp->inp_vflag & INP_IPV6) == 0)
continue;
if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr) ||
inp->inp_lport != lport) {
continue;
}
injail = prison_flag(inp->inp_cred, PR_IP6);
if (injail) {
if (prison_check_ip6(inp->inp_cred,
laddr) != 0)
continue;
} else {
if (local_exact != NULL)
continue;
}
if (IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr, laddr)) {
if (injail)
goto found;
else
local_exact = inp;
} else if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr)) {
if (injail)
jail_wild = inp;
else
local_wild = inp;
}
} /* LIST_FOREACH */
inp = jail_wild;
if (inp == NULL)
inp = jail_wild;
if (inp == NULL)
inp = local_exact;
if (inp == NULL)
inp = local_wild;
if (inp != NULL)
goto found;
} /* if ((lookupflags & INPLOOKUP_WILDCARD) != 0) */
INP_GROUP_UNLOCK(pcbgroup);
return (NULL);
found:
if (lookupflags & INPLOOKUP_WLOCKPCB)
locked = INP_TRY_WLOCK(inp);
else if (lookupflags & INPLOOKUP_RLOCKPCB)
locked = INP_TRY_RLOCK(inp);
else
panic("%s: locking buf", __func__);
if (!locked)
in_pcbref(inp);
INP_GROUP_UNLOCK(pcbgroup);
if (!locked) {
if (lookupflags & INPLOOKUP_WLOCKPCB) {
INP_WLOCK(inp);
if (in_pcbrele_wlocked(inp))
return (NULL);
} else {
INP_RLOCK(inp);
if (in_pcbrele_rlocked(inp))
return (NULL);
}
}
#ifdef INVARIANTS
if (lookupflags & INPLOOKUP_WLOCKPCB)
INP_WLOCK_ASSERT(inp);
else
INP_RLOCK_ASSERT(inp);
#endif
return (inp);
}
#endif /* PCBGROUP */
/*
* Lookup PCB in hash list.
*/
static struct inpcb *
in6_pcblookup_hash_locked(struct inpcbinfo *pcbinfo, struct in6_addr *faddr,
u_int fport_arg, struct in6_addr *laddr, u_int lport_arg,
int lookupflags, struct ifnet *ifp)
{
struct inpcbhead *head;
struct inpcb *inp, *tmpinp;
u_short fport = fport_arg, lport = lport_arg;
KASSERT((lookupflags & ~(INPLOOKUP_WILDCARD)) == 0,
("%s: invalid lookup flags %d", __func__, lookupflags));
INP_HASH_LOCK_ASSERT(pcbinfo);
/*
* First look for an exact match.
*/
tmpinp = NULL;
head = &pcbinfo->ipi_hashbase[INP_PCBHASH(
INP6_PCBHASHKEY(faddr), lport, fport, pcbinfo->ipi_hashmask)];
CK_LIST_FOREACH(inp, head, inp_hash) {
/* XXX inp locking */
if ((inp->inp_vflag & INP_IPV6) == 0)
continue;
if (IN6_ARE_ADDR_EQUAL(&inp->in6p_faddr, faddr) &&
IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr, laddr) &&
inp->inp_fport == fport &&
inp->inp_lport == lport) {
/*
* XXX We should be able to directly return
* the inp here, without any checks.
* Well unless both bound with SO_REUSEPORT?
*/
if (prison_flag(inp->inp_cred, PR_IP6))
return (inp);
if (tmpinp == NULL)
tmpinp = inp;
}
}
if (tmpinp != NULL)
return (tmpinp);
/*
* Then look in lb group (for wildcard match).
*/
if ((lookupflags & INPLOOKUP_WILDCARD) != 0) {
inp = in6_pcblookup_lbgroup(pcbinfo, laddr, lport, faddr,
fport, lookupflags);
if (inp != NULL)
return (inp);
}
/*
* Then look for a wildcard match, if requested.
*/
if ((lookupflags & INPLOOKUP_WILDCARD) != 0) {
struct inpcb *local_wild = NULL, *local_exact = NULL;
struct inpcb *jail_wild = NULL;
int injail;
/*
* Order of socket selection - we always prefer jails.
* 1. jailed, non-wild.
* 2. jailed, wild.
* 3. non-jailed, non-wild.
* 4. non-jailed, wild.
*/
head = &pcbinfo->ipi_hashbase[INP_PCBHASH(
INP6_PCBHASHKEY(&in6addr_any), lport, 0,
pcbinfo->ipi_hashmask)];
CK_LIST_FOREACH(inp, head, inp_hash) {
/* XXX inp locking */
if ((inp->inp_vflag & INP_IPV6) == 0)
continue;
if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr) ||
inp->inp_lport != lport) {
continue;
}
injail = prison_flag(inp->inp_cred, PR_IP6);
if (injail) {
if (prison_check_ip6(inp->inp_cred,
laddr) != 0)
continue;
} else {
if (local_exact != NULL)
continue;
}
if (IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr, laddr)) {
if (injail)
return (inp);
else
local_exact = inp;
} else if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr)) {
if (injail)
jail_wild = inp;
else
local_wild = inp;
}
} /* LIST_FOREACH */
if (jail_wild != NULL)
return (jail_wild);
if (local_exact != NULL)
return (local_exact);
if (local_wild != NULL)
return (local_wild);
} /* if ((lookupflags & INPLOOKUP_WILDCARD) != 0) */
/*
* Not found.
*/
return (NULL);
}
/*
* Lookup PCB in hash list, using pcbinfo tables. This variation locks the
* hash list lock, and will return the inpcb locked (i.e., requires
* INPLOOKUP_LOCKPCB).
*/
static struct inpcb *
in6_pcblookup_hash(struct inpcbinfo *pcbinfo, struct in6_addr *faddr,
u_int fport, struct in6_addr *laddr, u_int lport, int lookupflags,
struct ifnet *ifp)
{
struct inpcb *inp;
INP_HASH_RLOCK(pcbinfo);
inp = in6_pcblookup_hash_locked(pcbinfo, faddr, fport, laddr, lport,
(lookupflags & ~(INPLOOKUP_RLOCKPCB | INPLOOKUP_WLOCKPCB)), ifp);
if (inp != NULL) {
if (lookupflags & INPLOOKUP_WLOCKPCB) {
INP_WLOCK(inp);
if (__predict_false(inp->inp_flags2 & INP_FREED)) {
INP_WUNLOCK(inp);
inp = NULL;
}
} else if (lookupflags & INPLOOKUP_RLOCKPCB) {
INP_RLOCK(inp);
if (__predict_false(inp->inp_flags2 & INP_FREED)) {
INP_RUNLOCK(inp);
inp = NULL;
}
} else
panic("%s: locking bug", __func__);
#ifdef INVARIANTS
if (inp != NULL) {
if (lookupflags & INPLOOKUP_WLOCKPCB)
INP_WLOCK_ASSERT(inp);
else
INP_RLOCK_ASSERT(inp);
}
#endif
}
INP_HASH_RUNLOCK(pcbinfo);
return (inp);
}
/*
* Public inpcb lookup routines, accepting a 4-tuple, and optionally, an mbuf
* from which a pre-calculated hash value may be extracted.
*
* Possibly more of this logic should be in in6_pcbgroup.c.
*/
struct inpcb *
in6_pcblookup(struct inpcbinfo *pcbinfo, struct in6_addr *faddr, u_int fport,
struct in6_addr *laddr, u_int lport, int lookupflags, struct ifnet *ifp)
{
#if defined(PCBGROUP) && !defined(RSS)
struct inpcbgroup *pcbgroup;
#endif
KASSERT((lookupflags & ~INPLOOKUP_MASK) == 0,
("%s: invalid lookup flags %d", __func__, lookupflags));
KASSERT((lookupflags & (INPLOOKUP_RLOCKPCB | INPLOOKUP_WLOCKPCB)) != 0,
("%s: LOCKPCB not set", __func__));
/*
* When not using RSS, use connection groups in preference to the
* reservation table when looking up 4-tuples. When using RSS, just
* use the reservation table, due to the cost of the Toeplitz hash
* in software.
*
* XXXRW: This policy belongs in the pcbgroup code, as in principle
* we could be doing RSS with a non-Toeplitz hash that is affordable
* in software.
*/
#if defined(PCBGROUP) && !defined(RSS)
if (in_pcbgroup_enabled(pcbinfo)) {
pcbgroup = in6_pcbgroup_bytuple(pcbinfo, laddr, lport, faddr,
fport);
return (in6_pcblookup_group(pcbinfo, pcbgroup, faddr, fport,
laddr, lport, lookupflags, ifp));
}
#endif
return (in6_pcblookup_hash(pcbinfo, faddr, fport, laddr, lport,
lookupflags, ifp));
}
struct inpcb *
in6_pcblookup_mbuf(struct inpcbinfo *pcbinfo, struct in6_addr *faddr,
u_int fport, struct in6_addr *laddr, u_int lport, int lookupflags,
struct ifnet *ifp, struct mbuf *m)
{
#ifdef PCBGROUP
struct inpcbgroup *pcbgroup;
#endif
KASSERT((lookupflags & ~INPLOOKUP_MASK) == 0,
("%s: invalid lookup flags %d", __func__, lookupflags));
KASSERT((lookupflags & (INPLOOKUP_RLOCKPCB | INPLOOKUP_WLOCKPCB)) != 0,
("%s: LOCKPCB not set", __func__));
#ifdef PCBGROUP
/*
* If we can use a hardware-generated hash to look up the connection
* group, use that connection group to find the inpcb. Otherwise
* fall back on a software hash -- or the reservation table if we're
* using RSS.
*
* XXXRW: As above, that policy belongs in the pcbgroup code.
*/
if (in_pcbgroup_enabled(pcbinfo) &&
M_HASHTYPE_TEST(m, M_HASHTYPE_NONE) == 0) {
pcbgroup = in6_pcbgroup_byhash(pcbinfo, M_HASHTYPE_GET(m),
m->m_pkthdr.flowid);
if (pcbgroup != NULL)
return (in6_pcblookup_group(pcbinfo, pcbgroup, faddr,
fport, laddr, lport, lookupflags, ifp));
#ifndef RSS
pcbgroup = in6_pcbgroup_bytuple(pcbinfo, laddr, lport, faddr,
fport);
return (in6_pcblookup_group(pcbinfo, pcbgroup, faddr, fport,
laddr, lport, lookupflags, ifp));
#endif
}
#endif
return (in6_pcblookup_hash(pcbinfo, faddr, fport, laddr, lport,
lookupflags, ifp));
}
void
init_sin6(struct sockaddr_in6 *sin6, struct mbuf *m, int srcordst)
{
struct ip6_hdr *ip;
ip = mtod(m, struct ip6_hdr *);
bzero(sin6, sizeof(*sin6));
sin6->sin6_len = sizeof(*sin6);
sin6->sin6_family = AF_INET6;
sin6->sin6_addr = srcordst ? ip->ip6_dst : ip->ip6_src;
(void)sa6_recoverscope(sin6); /* XXX: should catch errors... */
return;
}
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